Borrowings Schedule of Short-term Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Schedule of Short-Term Borrowings [Abstract]
Securities sold under repurchase agreements with customers	$ 305,291	$ 304,467	$ 293,422
Federal Home Loan Bank Advances, Short Term	205,000	60,000	0
Federal Funds Purchased	22,000	25,000	12,000
Short-term borrowings	$ 532,291	$ 389,467	$ 305,422